Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Payables And Accruals [Abstract]
Accrued employee bonuses	$ 900,740	$ 2,150,418
Payroll and employee benefit accruals	469,530	698,969
Accrued professional fees	43,850	60,400
Accrued interest	245,350	156,492
Other accrued liabilities	210,826	292,186
Total accrued liabilities	$ 1,870,296	$ 3,358,465